JPS587065Y2 - Rotary piston engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake device for a rotary piston engine, and particularly to an intake passage structure that communicates with an intake port provided in a rotor housing.

Conventionally, a vortex chamber is provided in the carburetor to generate a vortex of intake air, and fuel is injected toward the vortex, and the area around the vortex chamber is heated with exhaust gas to atomize the resulting mixture. , those that promote vaporization are known.

However, conventionally, the air-fuel mixture generated by the carburetor is cooled while flowing down the intake passage.
There was a problem that the atomization and vaporization state of the air-fuel mixture could be deteriorated, and the purpose could not be fully achieved.

Generally, the atomization and vaporization of the air-fuel mixture affect the thermal efficiency of the engine, and at the same time have a significant influence on the drivability.

In particular, in the case of a multi-cylinder rotary piston engine, the atomization and vaporization of the mixture, as well as the distribution ratio of the mixture to each intake port, affect driveability. If the atomization and vaporization of air are not uniform, the actual distribution ratio of the air-fuel mixture will fluctuate, deteriorating driveability and thermal efficiency.

The present invention was devised in view of the conventional problems, and includes a substantially cylindrical shape that promotes atomization and vaporization of the air-fuel mixture in the middle of the intake passage from the carburetor to the intake port provided in the rotor housing. The present invention provides an intake device that is provided with a vortex chamber, and can supply the air-fuel mixture that has been atomized and vaporized in the vortex chamber from the intake port, thereby improving thermal efficiency, emissions, and driveability, especially in a low load range. The purpose is to improve.

In the present invention, the vortex chamber has an opening on the carburetor side of the intake passage from the tangential direction to the cylindrical inner peripheral surface, and the air-fuel mixture is introduced in a large swirl along the inner periphery of the vortex chamber. The air-fuel mixture atomized and vaporized by the swirling motion is guided into the working chamber from an intake passage on the intake port side that communicates with the center of the end face of the swirling chamber.

The above-mentioned intake structure is particularly advantageous in the case of a multi-cylinder low-repetition piston engine in that the swirl chamber has a large volume and can always maintain a good atomization and vaporization of the air-fuel mixture inside. The rate will not be biased.

The rotary piston engine of the present invention may be of a type in which at least one intake port is provided in the rotor housing, and even if the other intake port is provided in the side housing. It may be one or two.

The above-mentioned swirl chamber can be located anywhere in the intake passage, but the swirl chamber is formed inside the casing and the area around the swirl chamber is preheated by the cooled, high-temperature cooling water that flows through the casing. It is even more advantageous to do so.

The present invention will be described in detail below with reference to the illustrated embodiments.

In Figs. 1 and 2, 1 is a rotor housing 2 having a trochoidal inner circumferential surface and side housings 3 disposed on both sides of the rotor housing 2 (in the case of a 20-tor, one side is an intermezzo eight housing 3'). constructed casing,
4 is a polygonal rotor that rotates planetarily around an eccentric shaft 5; 6 is a working chamber surrounded by the inner surface of the casing 1 and the flank surface of the rotor 4; the volume of this working chamber 6 increases as the rotor 4 rotates; It changes continuously, and in the process, the intake air,
The process of compression, explosion, expansion and exhaust is repeated.

Reference numeral 7 indicates a peripheral intake port that opens on the inner peripheral surface of the trochoid of the rotor housing 2, 8 indicates a side intake port that opens on the rotor sliding surface of the side housing 3 (intermezoate housing 3'), and 9 indicates the peripheral intake port 7. 11 is a carburetor that supplies a rich mixture to the working chamber 6 through an intake passage 10 communicating with the side intake port 8; and 11 is a carburetor that supplies a lean mixture to the working chamber 6 through an intake passage 12 communicating with the side intake port 8. be.

Reference numeral 13 denotes a cylindrical swirl chamber provided downstream of the rich mixture intake passage 10. After the swirl chamber 13 promotes atomization and vaporization of the rich mixture supplied from the carburetor 9, the mixture is transferred to the peripheral intake port. 7 to supply a richer mixture.

This embodiment shows the case of a 20-meter engine, and the cross-sectional area of the swirl chamber 13 formed in the direction of the eccentric axis of the intermediate housing 3' is larger than that of the rich mixture intake passage 10. It is a large cylindrical hole, and is an intake passage 10 for rich mixture.
The axial center of the cylindrical surface of the vortex chamber 13 is communicated with the vortex chamber 13 from the tangential direction of the cylindrical surface, and the rich mixture is swirled largely along the cylindrical surface of the vortex chamber 13 to achieve atomization and vaporization. I'm trying to promote it.

In this case, it is desirable that a cooling water passage 14 be provided around the vortex chamber 13 and that the vortex chamber 13 be heated with high-temperature cooling water to further promote atomization and vaporization of the rich air-fuel mixture.

Peripheral intake ports 7.7 are communicated with the central portions of both end faces of the swirl chamber 13, and the concentrated air-fuel mixture in a vaporized state and well atomized at the center of the swirl flow in the swirl chamber 13 is transferred to both ports 7.
．． Distribute evenly among 7.

As shown in FIG. 1, the peripheral intake port 7
．． Reed valves IS and IS are installed inside the reed valves 15 and 15, respectively, and the reed valves 15 and 15 narrow down the rich air-fuel mixture to increase the flow velocity, and the fine vibrations of the valve body further atomize the fuel, while also reducing the amount of intake air. Prevent blowback.

In order to efficiently supply a rich air-fuel mixture in a good atomization state to the leading side of the working chamber 6 and achieve stratification, the opening position of the peripheral intake port 7 should be moved to the leading side within a range that does not cause large intake air blowback. While narrowing down the effective area and reducing the overlap between the intake and exhaust air, it also gives the intake air a high flow velocity, and the direction of the opening is parallel to the short axis of the trochoid or slightly inward, allowing the intake air to flow in the leading direction of the working chamber 6. It is effective to provide directionality toward the side.

In the embodiment shown in FIG. 3, when the load is low, the air-fuel mixture is supplied to the peripheral intake port 19 from the low-load intake passage 18 that branches downstream of the throat L4P17 of the carburetor 16, and the air-fuel mixture is supplied from the low-load to the high-load As we move to
The present invention is applied to a rotary piston engine in which an on-off valve 21 linked to a throttle valve 17 via a link interlocking mechanism 20 is opened to supply air-fuel mixture from a high-load intake passage 22 to a side port 23. It is.

In this case, the vortex chamber 13' has the role of promoting atomization and vaporization of the air-fuel mixture, especially at low loads when combustibility deteriorates, and transfers the air-fuel mixture that is well atomized and vaporized to the leading of the working chamber 6. It improves ignitability and combustibility under low loads, prevents misfires, and guarantees stable output.

In each of the above embodiments, the swirl chambers 13, 13' are provided in the side housing (ink mediate housing), but this is not necessarily the case. It can be placed in the aisle.

As is clear from the above, according to the present invention, the air-fuel mixture is caused to swirl greatly by flowing into the cylindrical swirl chamber from the tangential direction of the cylindrical surface. Atomization and vaporization of air can be promoted, and a mixture that is well atomized and vaporized at the center of the swirling flow inside the swirl chamber is directly supplied to the working chamber from the peripheral intake port that communicates with the center of the end face of the swirl chamber. be able to.

Therefore, according to the present invention, since the ignitability and combustibility of the air-fuel mixture can be improved, thermal efficiency can be improved, which is advantageous in terms of exhaust gas countermeasures, and fuel efficiency can also be improved.

Furthermore, when the present invention is applied to a 20-star engine,
By promoting atomization and vaporization, the homogenized air-fuel mixture can be evenly distributed, and engine drivability can be improved, especially in low-load operation including idling.

[Brief explanation of drawings]

Fig. 1 is an explanatory vertical cross-sectional view of essential parts of a rotary piston engine showing one embodiment of an intake system according to the present invention, Fig. 2 is an enlarged sectional view taken along line A-A in Fig. 1, and Fig. 3 1 is a diagram similar to FIG. 1 showing another embodiment of the intake device according to the present invention. 1... Casing (2... Rotor housing, 3... Side housing, 3'...
・・・Intermezoite Housing), 4...
・Rotor, 6...Open working chamber, 7.19...Peripheral intake port, 9,11゜16...Carburizer, 10,1B...Intake passage, 13゜13'・
... Vortex chamber, 14 ... Cooling water passage.

Claims (1)

[Claims for Utility Model Registration] In an intake system for a rotary piston engine, the rotor housing is provided with a peripheral intake port used at least during low load, and a mixture is supplied to the intake port from a carburetor through an intake passage, A cylindrical swirl chamber is provided in the middle of the intake passage, and the carburetor side of the intake passage is opened in the tangential direction of the cylindrical curved surface of the swirl chamber, while the intake port side of the intake passage is opened at the center of the end face of the swirl chamber. An intake device for a rotary piston engine, characterized in that the air intake device is connected to the air intake device.